SEASON 6, EPISODE 618 -
Newly discovered notes of a currently homeless and delusional paranoid schizophrenic, Pete Scanell (guest star Billy Lush - "The Black Donnellys"), lead the team to investigate if he killed his psychiatrist, Dr. Julie Ramierez (guest star Jacqueline Obradors - "NYPD Blue"), by arson in 2004, before dropping out of college and fully losing his grip on reality. Songs recorded by John Lennon are featured exclusively throughout the episode.